how to draw what i want like aquarelle not a compuste off geometrical details
I don’t know what the body of your post means, so I’ll answer your title question.
How to start drawing? Start drawing. Grab a pencil and draw, every day
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Whatever the technique used or the support or the fact to do it in a 3D or 2D space, a drawing corresponds to a geometry.
That is the reason why it is possible to create drawing software, on machines only understanding math language to compute results.
So, if you want your computer to compute results imitating aquarelle ; that implies that developers will use geometrical knowledge, at disposal, to produce numerical data.
That numerical data may be raster graphics or vector graphics in most of 2D drawing software.
Blender can import vector graphics as curves or raster graphics used as images, used as textures, editable in Image Editor.
But to draw in 3D space, it requires to create points, that are handling coordinates for the 3 dimensions.
Learn to draw.
Or especially for aquarells learn to paint.
I mean it, because if anyone wants to do something then one has to dig into the topic.
Are you a bad robot ?? Not one full sentences posted ever.
how many menu you should know to make it look like professionaly drawen
You mean “a drawing usually in transparent watercolor”? (def)
Blender is not a drawing or painting program. You can probably create materials and render to resemble that style of painting but you would be better served by a 2D painting program or real paint and brushes.
You won’t be a professional nor produce art of that level if your attitude is to learn the minimum about the subject and tools.
I hope you have and develop the skills to succeed. If Blender is a tool that works for you then you will find plenty of help, advice, and encouragement here at BA.
If you want to use Blenders Grease Pencil to do your art, then start watching Sophie Jantaks tutorials on YT.
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Like this artisit … Flokart … ??
Have you seen this … https://blendermarket.com/products/blender-illustration-shader-advanced?ref=2 … ??
if you’re trying to achieve a brushy / sumi-e style then maybe this will help https://twitter.com/wutianqing_/status/1593471514942140417?s=20
Yepp… she did some fascinating things with blender…
Also: it’s sooo nnnicceee how people try to help… given so such a wee bit of info… 
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so what i should do if i wanr to draw a fkower but not with circle or a cube?
??
I think you’d be better off downloading one of any of the traditional programs for 2d art and drawing.